<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
        document.getElementById('demo').onclick = function () {
          console.log('单击');
        };
      </script>
      <div id="demo">测试</div>
</head>
<body>
    
</body>
</html>